ISSN:
1432-1106
Keywords:
Man
;
H-reflex
;
Reciprocal Ia inhibition
;
Voluntary movements
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Effects on the H-reflex of the triceps surae muscle from the volleys in the common peroneal nerve were investigated in normal human subjects at rest and during voluntary ankle movements. A depressive effect was revealed during active dorsiflexion but not at rest. Since this depression was evoked by volleys of low-threshold afferents and had a very short latency which suggests a disynaptic linkage, it was regarded as the reciprocal Ia inhibition. In an exceptional case, which showed an H-reflex in pretibial muscles at rest in spite of normal central nervous functions, reciprocal Ia inhibition of the triceps surae as well as pretibial motoneurones was observed in a resting state. It was stressed that there is a close parallelism between the excitability of a group of a-motoneurones and of interneurones which mediate Ia inhibition of the antagonists. Relying on recent observations from animal experiments neuronal mechanisms of the present observation were discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00237171
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